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I ran a open down pipe on our car and it was loud and I think it sounds like shit. But that's me. I had flows on it at first when I took the flows off I could feel a BIG difference in power and spool time. So I would stay away from them I ended up putting a Moroso Spiral Flow mufflers on it I love them and the really hush the car down they give a very deep sound . I am only seeing 3psi of back pressure with them at 18 psi. at 9 psi I see no back press. at all.But like said above turbos love straight through mufflers
 
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